There's a hole in the sky and other questions about the environment There is a hole in the sky and other questions about the environment Other title：There is a hole in the sky and other questions about the environment I wonder why there's a hole in the sky :and other questions about the environment I wonder why there's a hole in the sky :: and other questions about the environment / I wonder why．There's a hole in the sky :：and other questions about the environment / The sea is salty and other questions about the oceans Other title：Sea is salty and other questions about the oceans How does the ear hear? and other questions about the five senses Other title：Sun rises and other questions about time and seasons